Machine for boring brush-blocks



(No Model.)

W. S. MQKINNEY.

MACHINE FOR BORING BRUSH BLOOKS.

2 Sheets-Sheet 1.

N wnzns, FbalwLilhognphcr, Wuhington. 04 c.

(No Model.) 2 Sheets-Sheet 2.

W. S. MoKINNEY.

MACHINE FOR BORING BRUSH BLOCKS.

No. 276,188. Patented Apr.24, 1883.

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--- I IIHH' IE H D NITED STATES PATENT Faro.

\VALTER S. MCKINNEY, OF BINGHAMTON, NEW YORK.

MACHINE FOR BORING BRUSH-BLOCKS.

SPECIFICATION forming part of Letters Patent No. 276,188, dated April 24, 1883.

Application filed December 12, 1882. (No model.)

To all whom it may concern Be it known that I, WALTER S. MCKINNEY, of Binghamton, in the county of Broonie and State of New York, have invented a new and useful Improvement in Apparatus for Boring Brush-Blanks; and I do hereby declare that the following is a full, clear, and exact description of the same.

Myinvention is an improved machine for boring the backs of brushes. It is especially designed to bore in backs of circular, oval, or any irregular form circular concentric rows of holes.

The general principle of the invention includes in one automatic machine devices for automatically rotating the brush-back step by step, with operation of the bit in the intervals when the back is at rest, until one complete circle of holes is bored, when the apparatus shifts automatically to bring the bit into adjustment with an inner circle, on which a second row of holes is in like manner bored, and so on to the center, where a single hole is bored.

In the accompanying drawings, Figure 1 shows the machinein side elevation minus the boring devices. Fig. 2 shows a side elevation, one-quarter turned from the position of Fig. 1. Fig. 3 is a plan view. Fig. 4 is a detail view of the form of ratchet and paw]. Fig. 5 is a diagram showing the concentriclines of holes.

These drawings illustrate the form in which I have embodied my invention. As thus represented, M shows a base, on which is fixed a standard,N, supportingthebitandother mechanism hereinafter described. On the same base is a plate, J, in which slides a base, D. This base D affords a bearing for the lower -end of a shaft, B, the upper bearing of which is in the standard D, fixed upon the base D. The upper end of the shaft B carries a seat, m, and clamps m n for the brush-back. The clamps are pivoted at0,and are drawn together by the spring 1) to hold securely the back. Space is left between.the pivoted ends of the clamps to admit a handle of the back, if one be used. The back lies flat in the seat between the clamps, which bear upon its edge. It will be borne in mind that this seat is revolved to bring the back by step-by-step movement into position to be bored, and that when one circular row of holes is bored it is to be shifted to bring the point of the bit nearer the center of the back. Consequently two motions are required of the'shaft B and seat 112-- one of intermittent rotation and the other of lateral shifting. The first or rotary movement is imparted to the shaft by the pulley c and band K. the band running in direction of the arrow, Fig. 1. This movement of the band is continuous, but is converted into intermittent motion in the shal't by means of the form A and pawl-lever E and the slipping of the band. The form Ahas three series of ratchet-wheels, such as that shown in plan, Fig. I. These are numbered in inverse order from the top, 4. 3 2. These ratchet-wheels are separated by flanges 8 and 7, it being understood that flanges and wheels are all a solid part of the form A. Below the ratchet 2 is a single notch, 1. The ratchet-teeth face in the direction of the movement ofthe band K. The number of the ratchets may be varied.

On the rear of the plate D is fixed a standard, F. The upper end carries a swivel, 9, in which on horizontal pivot is suspended lever E, the

rear end of which is connected to the base- I plate J by link G, and is drawn to the left by spring 13. This spring causes the forward end to press spur ll fixed thereon into contact with teeth of ratchet-wheels on form A. So long as this spur is engaged with a ratchet-wheel the form and seat at are held stationary, and the band slips. The lever E is drawn aside intermittently by means of a cam-wheel, f, acting upon a lever, g, connected to lever E by link h. The cam-wheelfis on shaft 14, which is driven by any suitable connection with the main driving-shaft of the machine; The camwheelf carries a wrist-pin, 15, in its face, which is connected to a lever, O, which is pivoted in the standard N, and raises or depresses the bit-shaft. The raised portion 16 of the cam-wheel is adapted to strike the end of lever g, and by quick movement throw it down and then allow it to return. This movement for an instant draws out the spur from engagement with the ratchet-wheel of form A, and permits the form to move one step, which step is equal to the space between two holes of the circle bored in the back. The parts are so arranged and the movements so timed that while the spur of lever E is engaged with the tooth of the ratchet-wheel the bit descends and bores a hole. As the bit rises the spur is withdrawn and the wheel slips around over one notch when it is again caught by spur 11, which is immediately forced into engagement by spring 13. This action continues until the form in revolution has brought the bit around to the last hole in the circle.

It will be understood that the upper ratchet, 4, regulates the boring of the first or outer annular row of holes. When the form therefore has turned a complete revolution, and brought the last tooth to the spur, the notch 22 in the separating-flange 8 is directly underneath the spur,which drops through into the second space between flanges 7 and 8, and is ready to engage with teeth of ratchet 3. These teeth are less in number, and correspond with the number of holes in the next inner row of holes in the back. The revolution of the form is accomplished when the spur of the lever E is in this division of the form in the same manner as that described above. When it is completed the form bears directly below the spur or notch 23 in the flange or partition 7, and the lever drops with the spur in the lower division, and in contact with the third ratchet,

which has a still less number of teeth corresponding to the nuniber of the inner or third row of holes. This is the last row provided for in the machine shown, and when the spur has traversed this wheel it comes opposite a single notch, 1, in which it is represented as,

resting in Fig. 1. This holds the form for the last or central hole. It will be obvious, however, that in connection with the above described arrangement of boring the rows of holes provision must be made for the eccentric location of the bit in relation to the center of the seat at. This center coincides with the center of the shaft B, and with the center of the brush back when placed on said seat.

It will be observed that the shaft B and the post F, which carries the lever E, are all mounted upon the sliding plate D, but the rear end of the lever E is bent downward and is connected by a screw, 25, to the fixed plate J, and it will be apparent therefore that the movementof the horizontal end of the lever will shift the plate D and slide it upon its base J, and when the horizontal end of the leveris raised to bring the spur into contact with the ratchet 4 the base D, as represented in Fig. 1, will be pushed to its extreme left-hand limit. The band K is drawn constantly toward the right by means of a pulley, T, connected with a weight, as represented in Fig. 3, thus tending to draw the sliding frame D to the right of Fig. 1. When therefore the revolution of the form has brought the notch 22 directly underneath the spur, the lever drops into the next space, and as the notch 23 is not directly under notch 22 the spur rests upon the flange 7 until the second revolution has brought the notch 23 around, when the spur and lever can drop into thespace 2.

When it drops into the space 3 it allows the base-plate D and seat m to be carried one step to the right. This shifts the seat sufficiently to bring the line of theinner circle, 26, of the brush back under the bit, where it remains. When the spur on lever E drops into the space 2 it shifts the seat, so as to bring the line of the inner circle of holes, 27, under the bit, where itremainsuntil that row is bored, which is'completed at the instant when the notch 1 comes around under the spur. At the instant when the spur drops into that notch it depresses the lever sufficiently to allow the plate D to be drawn far enough to the right to bring the center 28 of the brush-plate directly under the bit, at which time the center hole is bored. The bit-stock a is square or polygonal in form, and passes through the pulley I), having motion imparted to it by a suitable belt.

It will understood that at the commencement of the operation the form is moved sufciently to the left to bring the bit in line with the outer circle.

In operating the machine the attendant, in order to start it, raises the lever E, bringing the spur into the upper space, 4, locating it against the tooth next in rear of the notch 22. He then starts the machine by releasing the brake-lever P. The form revolves step by step until revolution is completed, when the lever drops into the second space, and so on, as heretofore explained. The brush-back is then taken out and a fresh one put in its place.

Although I have described the machine as used for boring, it is adapted also for chasing and like work with no other modification than that of a change in the tool. It is capable also of working in combination with duplicate machines, all working from the same pattern or more than one pattern.

Manifestly the details of construction may be greatly varied without departing from the spirit of my invention.

Having thus described my invention, what I claim is- 1. In combination, in the described machine, a reciprocating and rotating tool, a seat for the article to be operated upon, a shaft supporting said seat, mechanism for giving the shaft step-by-step rotary motion, and mechanism, substantially as described, for shifting the position of the seat in relation to the cen'- ter, substantially as described.

2. In the described machine, a shaft, B, carrying the seat for the article to be operated upon, means for imparting rotary motion to said shaft, a ratchet-wheel on the shaft, and a lever provided with 'a spur engaging with said ratchet, operating to hold intermittingly, and mechanism for releasing said spur, said mechanism operating in connection with a rotating tool, substantially as described.

3. In the describedmachine, and in combination, the rotating and reciprocating shaft B, mounted on plate D, and means forimparting rotary motion thereto, a form on said shaft having a series of ratchet-wheels of varied size separated by flanges having therein notches, the spur-lever E, mounted on standard on plate D connected to the base, and means for intermittingly drawing back the spur, all substantially as and for the purpose set forth.

4. In the described machine, the form A, composed of a series of ratchet-wheels dividing flanges 7 8, having notches 22 2 provided also with notch 24, in combination with the lever E, base;plate D, connecting-link G, and the base-plate I, and suitable tripping mechanism, substantially as described.

5. In the described machine, the base M and standard N, carrying the rotating and vertically-reciprocating tool, the lever 0, link 6, wheelf, and the tripping mechanism, all in combination with the shaft B, its rotating mechanism and seat, and its form A and detect or pawl mechanism, substantially as described.

swiveled piece, 9, connected to the fixed piecehy the link G, and provided with a spring, 13, substantially as described.

In testimony whereof Ihave signed my name to this specification in the presence of two subscribing witnesses.

WALTER S. MCKINNEY.

Witnesses:

EDWARD WnRoNNEBnRGER, WM. A. MCKINNEY. 

